For Potted Modules (black color) shipped before August of 2012, you can test by applying power to the potted circuit breaker to and if good the following voltages will be seen (be careful...
The miniature banana plug on the module can be ordered directly from the part manufacture (Pomona Electronics, Sales: 900-490-2361 part number model #4513) or from (Digi-Key part number 501-1425-ND).